This thread is absolutely amazing.
I was on a committee last year to document Greek Life activities since our school was founded but I only took one picture. I'll have to go back through the yearbooks (when my school used to do them) and find some more!
But here's my chapter when my school was still Lawrence Institute of Technology in 1972 (or '73) a few months after affiliating (10/23/71)! (formerly Kappa Phi Sigma):
One of those guys is my Big (x18) Brother! I'm in one of the only original families